Conformal Mapping and Bound States in Bent Waveguides
Abstract
Is it possible to trap a quantum particle in an open geometry? In this work we deal with the boundary value problem of the stationary Schroedinger (or Helmholtz) equation within a waveguide with straight segments and a rectangular bending. The problem can be reduced to a one dimensional matrix Schroedinger equation using two descriptions: oblique modes and conformal coordinates. We use a corner-corrected WKB formalism to find the energies of the one dimensional problem. It is shown that the presence of bound states is an effect due to the boundary alone, with no classical counterpart for this geometry. The conformal description proves to be simpler, as the coupling of transversal modes is not essential in this case.
Cite
@article{arxiv.1011.0694,
title = {Conformal Mapping and Bound States in Bent Waveguides},
author = {Emerson Sadurni and Wolfgang P. Schleich},
journal= {arXiv preprint arXiv:1011.0694},
year = {2015}
}
Comments
16 pages, 10 figures. To appear in the Proceedings of the Symposium "Symmetries in Nature, in memoriam Marcos Moshinsky"